Possible to remove part of a rigid body bake?
I see two possible solutions here.

You can bake animation to keyframes, and then remove the part of the keyframes that you don't need.

Also, you can create a new object, that will use copy location / rotation / transformation constraints for mirroring baked transformations into a new object. Ones it is done, you will get the ability to set off this constraints by animation influence value from 1 to 0